Tier 2 Dependent Visa Query

Hi All ,

I am a ICT Tier 2 visa holder with validity till Feb 2020 . My spouse have the dependent visa with same expiry date . Due to change in circumstances my organisation wants me to travel back to home country by end of August . My spouse is currently is studying a course which will be ending by mid September .

Is it possible for her to complete the course and return to India after two weeks ?

If tats not possible there any grace period how long she can stay after main applicant left the country . Any lead will be helpful to handle this situation in legal way . Thanks in advance